Grease pump



P. D. HARTOG July 4, 1933.

GREASE PUMP 5 Sheets-Sheet 1 Filed July 19. 1929 A H H P. D. HARTOG July 4, 1933.

GREASE PUMP Filed July 19, 1929 5 Sheets-Sheet 2 Jmnfly 4, 11933 P. D. HARTOQ 1,916,948

GREASE PUMP Filed July 19, 1929 5 Sheets-Sheet 3 Patented July 4, 1933 TTES UNET PAUL D. HARTOG, F ST. LOUIS, MISSOURI, ASSIGNOR, BY MESNE ASSIGNMENTS, TO FRIER'HAETOG, INCQBPOR-ATED, A CORPORATION OF NEW YGPJK GREASE PUMP Application filed July 19, 1329.

This invention relates to grease pumps, more particularly to that class of grease pumps adapted for use in pumping lubricating grease to journals and bearings of machinery, and automotive chassis, and to be used to transfer grease lubricants from one container to another.

in that class of grease pumps in which is employed an eccentric or crank lever and connecting rod for the purpose of operating the piston of the pump reciprocally, there is a resulting out of balance produced by a construction of this kind, which at rotative speed causes objectionable vibrations, unnecessary wear, and noisy action of the parts. There is also an additional objection to the employment of an eccentric or crank lever upon a piston in that undue wear is eifected upon the piston and cylinder in which the piston operates due to the force of the thrust which is set up by the angularity of the eccentric or crank with respect to the piston in the path of motion of the eccentric or crank, which tends to wear the piston and cylinder very rapidly, thereby aifecting the eflicient action of the pump because of leakage occurring be tween piston and cylinder wall.

Gee of the objects therefore, of the present invention is to provide a grease pump constructed in such a novel way that the empioymcnt an eccentric or crank lever and connecting rod is rendered unnecessary.

r inother obj cot is to provide a grease pump in which the operating parts are properly balanccd, thereby reducing vibration and wear to a minimum.

A further object is to provide a grease pump in which the operating parts are posi tioned in axial lengthwise alignment, by which a smooth operating performance is insured.

Further and other objects of the present invention are to provide a grease pump of minimum production cost, and one in which the several parts are duplicable and interchangeable, compact in general arrangement; and one in which the moving parts are enclosed. so that foreign matter in the form of grit, dust, and dirt cannot come in contact with the operating parts.

Serial No. 379,508.

To such ends the invention comprises a novel construction and combined relation of mechanical member parts and in order therefore, that others skilled in the art to which this invention relates are enabled to understand, make and use the same, the following description is given supplemented by the accompanying drawings, in which:

Figure 1 is a plan view of the present invention.

Figure 2 is a side view in elevation, having an exposed cross-section thereof.

Figure 3 is a front elevation with a portion in section exposed.

Figure 1 is a detailed view of an assembly of operable member parts. i

Figure 5 is an end view in elevation of the cylinder of this construction.

Figure 6 is an end view of one of the member parts.

Figure 7 is a view partly in section of the cylinder and member parts of this construction.

In the drawings the member parts are designated by numerals, like numerals designating like parts throughout the several views, accordingly numeral 10 designates a suitable base frame upon which is mounted a frame or support 11 provided with an internal reinforcement rib 12, and a lengthwise cylindrical bearing 13. Above the cylinder bearing 13, and upon the surface of the support 11 an electrical motor 14 is positioned the projecting end of the motor shaft having a driving gear 15 fixed thereto and adapted operatively to mesh with a driven gear 16, which gear has a web 17 and a central hub 18. The driven gear 16 is securely fixed to a rotative shaft 19 (a detailed view of which is shown in assembly Fig. 4:)- The rotative shaft 19 has a reduced end hearing portion 20 by which a shoulder 21 is provided, having a bearing against the surface of a. projecting ledge 22 formed upon the journal 20, which journal is also provided with a flanged portion 24, the rotative shaft 19 extends beyond the bearing portion 20, having a projecting portion 24 which is slightly reduced and upon which the driven gear 16 is fixed and held securely against lateral displacement by means of a disc collar 25, which is provided with a slotted aperture 26, so that the disc collar thus constructed is adapted to be seated in a groove 27 formed on the shaft end 24. The reduced diameter of the shaft portion 24 provides a shoulder 28 against which the face of the hub 18 of the gear 16 is 'abutted, hence the face of the hub 18 and the shoulder 21 on the shaft provides a thrust bearing surface against the resp .ctive fa of the journal 20, the flanged portion 23 of the journal is provided with holes to receive clamping bolts 29 which enter threaded apertures formed in bosses 30, (designated in dotted outline Fig. 1) which bossesare positioned and formed within the supporting frame 11, whereby the journal-2O is clamped and securely held to the supporting frame 11 and prevented from disaligmnent by means of the ledge 22, the circumferential surface of which being accurately fitted into the lengthwise cylindrical bearing 13, whereby the. journal 20 is accurately aligned with the bearing Projecting from the journal 20' and into the cylindrical bearings 13 is that portion of the rotativc shaft 19, which has operative engagement with a c rcularly formed-bod y 31, the circumferential surface ofcwhich is :the axis of the body 31 shaped and sized' to accurately fit upon the surfaces 32- of the rotative shaft 19, a view of the shape of the aperture in the body 31 is shown in an end view thereof Fig. 6.

Upon the circumferential surface of the body 31 and midway of its length there is provided a. cam shaped form 34 which extends circumferen lly therearound and of limited depth the i, tue cam shaped form having a predetermined helical'pitch, the purpose of which will be hereinafter more fully explained. c

Referring to Fig. 3 and in which there is shown in the exposed sectional view thereof an assembly unit positioned in an aperture 35 formed and positionedat asuitable locationin the si( e of the support 11 and extending thcrethrough and within 1. boss 36 provided within and integral with the support 11 a dotted outline of the boss referred to is shown in the plan View Fig. 1). The. assembly unit thus posi loned comprises members constituting a sleeve 37, having a.

hexagonal head 38 and provided with a lengthwise aperture and into which a stud 39 is positioned having a slightly enlarged end portion 40, which provides a slight shou der for thestud 39, and an enlarged portion.

forming a rim 41. The enlarged end por tion 40 and 41 has a roller 42 mounted there- 011, which roller is provided with an aperture cmiforining in size and shape with the end of the stud 40 and 41, and upon which the roller has its hearing. The roller 42 is constructed and designed to roll freely upon its stationary beariin and within the cam shaped form 34 of the bed" 31, the stud 39 being clamped securely in the sleeve 37 by the hexagonal nut 43 upon the threaded end of the stud 39, which when tightened draws the should-er of the stud firmly against the face of the sleeve The entire assembly unit thus construct-ed and operatively positioned in the support 11 can be conveniently rcinm'cd from the support inthe event of the wearing of the roller 42, the worm roller can be displaced by thatof a new roller the entire unit then reinserted into its aperture by screwing the sleeve 37 into the threaded portion within the aperture.

Attached to the end face surface of the body 31 there is removably attached a disc plate 44, which is secured to the end face of the body 31 by means of the screws 45 passing through holes slightly enlarged in the disc 44, which screws enter into threaded portions in the body 31. The enlarged holes within the disc 44 allow the slight adjustment of the prior to the tightening of the screws, for the irpose of aligning the piston 46 operatively with the cylinder in which the piston operates. The piston re 46 is securely fixed to the disc 44 by a shouldered edge 47 formed on the piston which edge is pressed tightly into a central hole formed in the disc plate 44 and therein riveted to the disc plate 44.

Connected to the support 11 and projecting the efrom is that of a trunk body 48, having an internal tubular form and provide ed with flanged end 49, having apertures to receive clamping bolts 50 which enter into threaded holes formed in the internal bosses 30 of the support 11. Projecting from the flanged end 49 is a ledge 51, the circumferential edge of which is accurately fitted to the cylindrical bearing 13 by means of which the trunk body 48 is held securely in accurate alg'ninent with the cylindrical bearing 13. ll' ithin 't-hetrunk body 48 a circularly formed member 52 inserted in the respective position within the trunk 48 as indicated in the drawingFig. 2, there being a rim 53 on the member 52 and a threaded end 54, upon which threaded end a cap 55 is screwed whereby the member 52 is held securely in position, the member 52 is shown in assembly with an exposed section thereof at Fig. 7. The member 52 is provided with an aperture 56 denoininatec the cylinder and in which the piston 46 operates reciprocally, the limit of its travel in the stroke backwardly is indicated in dotted outline 57, at which position the material to be pumped fills the space vacated by the piston through the port holes 58 and upon the forward stroke of the piston the material so received is forced forwardly throu h the small aperture 59 and then outt: l wardl throu h the a ierture 60 of the can 55 a: l i 7 to the threaded end of which there is an engaging connection (not shown) and through which, resulting from a consecutive number of strokes, the material is conveyed to the place desired. I

For the purpose of preventing the return of the material acted upon by the piston through the small aperture 59, a checl; valve is provided consisting of the well known spring pressed ball upon a seat housed within a bushing or sleeve 61, the spring which presses against the ball is tensionally abutted against a sheet metal aperture disc 62, which is clamped against the face of the body 52 by the threaded cap 55. At the end of the cap 55 a threaded aperture is provided in which a thumb screw 63 is positioned and removable only in the event the pump requires priming for pumping purposes.

At a suitable position, approximately thi end of the trunk body 4h, projecting bosses are formed G l and 65 i spectively, which bosses are integrally joined with the trunk body. T he boss 64.: is provided with a flange 66, and upon which agrease container 67 is mounted and held securely by bolts 68, the projecting boss 64: has an internally cored chamber 69 through which the grease flows from the container to the cylinder, and into which the grease is drawn by the piston. The boss 65 is provided with a threaded aperture 70 and into which one end of a thread stud 71 is screwed and held in position by a lock nut 72, the other threaded end of the stud 71 ente a stool having a flange portion 73 and a boss portion T l in which boss portion T l there is a non-threaded aperture 73 to receive the end of the stud 71. The flange portion '74 and a projecting hub 75 forming the stool have holes passing through the flange portion for clamping the bolts 76 which bolts screw into the base frame 10, thereby holding the stool. firmly upon the base, the stud 71 is provided with a nut 7'? which. is adjustable upon the stud, the bearing face of the nut 76 rests upon the face of the hub 45, thereby resisting the load upon the trunk body 48 from the weight of the load in the container.

In the present invention it is obvious that the motor operates the train of gears with which the shaft 16 is connected and thereby rotated. The body 31 engaging the sha t 19, is also rotated by the shaft and ti o ,ionarily positioned roller 42 which is seated operatively within the cam shaped form on the body 31 operates upon the fixed stud in the support 11 in consequence of which the body is moved forwardly and backwardly in a reciprocal movement t the extent of the pitch of the helical path of the cam shaped form, thus a rotatable and reciprocal movement is imparted to the body 31 and also to the piston witn which the body connected, the piston therefore is operated within the cylinder in the same way, that is, rotatably and reciprocally.

accordance with the foregoing description, it is clear that the present invention fulii s the purpose for which it is intended and it is undei tood as well as conceded that various changes may e made in the details of the construction without departing from spirit of this invention, understanding tnenrfore that this invention is not to be limited to the specific construction shown and described.

l claim as my invention and desire to secure by United States Letters Patent:

1. in a pumping apparatus, a stationary case receiving cylinder having an inlet outlet opening therein, a supply tank l adjacent said cylinder and communia ng therewith through the inlet opening in the cylinder, said tank holding the fluid to be pumped, a piston arranged in said cylinder, a second cylinder arranged in alignment with the grease receiving cylin dcr and having a greater diameter than the receiving cylinder, a piston operating member arranged in said last nailed cylinder and bearin against the walls thereof, means a djustably connecting said piston op erating member and said piston to permit aligning of said piston with its cylinder, means to rotate said piston operating member on an axis in alignment with the longitiulinai axes of said cylinders, means whereby rotation of said piston operating member imparts a reciprocating motion to said piston in its cylinder, said reciprocating 1nd tion of the piston serving to alternately cover and uncover the inlet opening in the first mentioned cylinder, and a check valve arranged to close the outlet opening in the first mentioned cylinder on the non-pressure stroke of the piston.

till

ranged in the said cylinder, a second cylinder arranged in alignment with the grease receiving cylinder and having a greater di ameter than the grease receiving cylinder, a

longitudinal shaft arranged centrally of said I alternately cover and uncover the inlet opening in the first mentioned cylinder, and a check valve arranged to close the outlet opening in the first mentioned cylinder on the non-pressure stroke of the piston.

In a pumping apparatus, a supporting frame, a pair of aligned cylinders having different diameters and arranged in spaced relation upon said frame, a motor mounted upon the larger of the two cylinders, and

j positioned with its rotor shaft in parallel relation to the longitudinal axis of the cylinder upon which it is mounted, a driving gear on the rotor shaft of said motor, a driven gear, a shaft operatively connected to said driven gear and extending into said cylinder of largest diameter and arran ed parallel to the longitudinal axis thereof, a piston arranged in the cylinder of smallest diameter, a piston operating member slidably arranged on said last named shaft and bearing upon the inner walls of the cylinder of largest diameter, and means whereby rotary motion of said piston operating member causes a reciprocating motion of said piston in its cylinder.

sill-X pumping apparatus comprising in combination, a pair of shafts operatively connected and arranged .in pa "sllel relation, a guide-way arranged in a :11 alignment with one of said shafts, a journal supportedly connected to said guide-wayand supporting the said shaft in axial alignment with said guide-way, said last mentioned shaft having an unsupported'free end portion constructed to provide driving means and a slide-way and projecting into said guideay, abody embraced within said guideway, said body having a cavity constructed for operative engagement upon the fr 2 end portion of the projected shaft within said guide-way, a piston 1'o(l' connecte(l detachably to and adjustable on said body, a cylinder for said piston, and a fluid supplycon tainer m unted upon said cylinder.

5. A pumping apparatus comprising in combination, a driving shaft and a driven shaft,.a guide-way arranged in parallel rela tion with said driving shaft, ajournal supportedly connected to said guidesway, said driven shaft supported by and bearing in said journal, said driven shaft having an unsupported free end portion projecting into saidguide-way and constructed to provide driving means and a slideway, a body embraced within said guide-way and operative uponthe free end portion of said driven shaft, a piston rod connected detachably and adjustably upon said body, a cylinder for said piston, and a fluid supply container mounted upon said cylinder.

6. A pumping apparatus comprising in combination, a driving shaft and a driven shaft, a guide-way arranged in parallel relationship with said driving shaft and inaxial alignment with said driven shaft, a journal supportedly connected to said guicle way, said driven shaft supported by and bearing in said journal, said driven shaft having an unsupported free end portion constructed to forma tenon and projecting into said guideway, a body embraced within saidguid'e-way and provided with a cavity constructed to form a mortise adapted for operative engagement upon thetenon of said driven shaft, a pis-zton conn ected'to said body, a cylinder for said piston, and a fiuid'supply container mounted upon said cylinder.

- 7. The combination with the piston rod of a grease pump, of a driving mechanism therefor c r mprising a cylinder aligned with the lon itudinal axis of the piston rod, a piston operating member slidably engaging the cyl inder and bearing upon the inner walls thereof, a cam groove about the periphery of said piston operating member, a member carried by said cylinder and projecting inwardly therefrom into said cam groove, and means to rotate said piston operating memberl 8. An apparatus for imparting reciprocatory movement to the piston of a grease pump comprising a cylinder, a rotor shaft project ing axially into said cylinder, a piston operating body arranged in said cylinder and bearing upon the inner walls thereof, said body being capable of sliding movement relative to the shaft and rotatable therewith, a cam groove arranged eircumferentially about said body, a member projecting radially inwardly from said cylinderwall'a'nd engaging said cam groove, and means to rotate said shaft. i z

In confirmation hereof I hereto attach my signature.

PAUL HARTQG. 

